diff -up lensfun-0.3.0/CMakeLists.txt.mandir lensfun-0.3.0/CMakeLists.txt
--- lensfun-0.3.0/CMakeLists.txt.mandir	2014-09-30 19:37:34.000000000 +0200
+++ lensfun-0.3.0/CMakeLists.txt	2014-11-19 17:48:07.874096303 +0100
@@ -87,6 +87,7 @@ SET(INCLUDEDIR include CACHE PATH "Direc
 SET(DATADIR share/lensfun CACHE PATH "Directory for library data files")
 SET(TESTSBINDIR share/lensfun/tests CACHE PATH "Directory for test and example programs")
 SET(SCRIPTDIR ${BINDIR} CACHE PATH "Directory for helper scripts")
+SET(MANDIR share/man CACHE PATH "Root directory for man page files")
 
 IF(INSTALL_HELPER_SCRIPTS)
   FILE(GLOB HELPER_SCRIPTS apps/*)
diff -up lensfun-0.3.0/docs/CMakeLists.txt.mandir lensfun-0.3.0/docs/CMakeLists.txt
--- lensfun-0.3.0/docs/CMakeLists.txt.mandir	2014-11-19 17:48:07.874096303 +0100
+++ lensfun-0.3.0/docs/CMakeLists.txt	2014-11-19 17:51:27.562844291 +0100
@@ -37,6 +37,6 @@ INSTALL(FILES
     ${CMAKE_CURRENT_BINARY_DIR}/g-lensfun-update-data.1 
     ${CMAKE_CURRENT_BINARY_DIR}/lensfun-update-data.1 
     ${CMAKE_CURRENT_BINARY_DIR}/lensfun-add-adapter.1 
-    DESTINATION ${CMAKE_INSTALL_PREFIX}/man/man1
+    DESTINATION ${CMAKE_INSTALL_PREFIX}/${MANDIR}/man1
 )
 ENDIF(INSTALL_HELPER_SCRIPTS)